Question 1

Which of the following is consistent with an exothermic reaction that is spontaneous at all temperatures?

Accepted Answer

A) ($\Delta$H > 0, $\Delta$S  0, $\Delta$S > 0, $\Delta$G  0, $\Delta$G  0, $\Delta$S  0) 
A) ($\Delta$H > 0, $\Delta$S  0, $\Delta$S > 0, $\Delta$G  0, $\Delta$G  0, $\Delta$S  0)

Question 2

For the reaction 3H2(g)+ N2(g)    
2NH3(g), Kc = 9.0 at 350°C.Calculate $\Delta$G° at 350°C.

Accepted Answer

Question 3

Which of the following is consistent with a spontaneous process in the forward direction?

Accepted Answer

A) ($\Delta$Suniv > 0, $\Delta$G univ > 0) 
B) ($\Delta$Suniv  0, T$\Delta$Suniv univ > 0, $\Delta$G univ univ univ univ > 0, $\Delta$G > 0, T$\Delta$Suniv > 0) 
A) ($\Delta$Suniv > 0, $\Delta$G univ > 0) 
B) ($\Delta$Suniv  0, T$\Delta$Suniv univ > 0, $\Delta$G univ univ univ univ > 0, $\Delta$G > 0, T$\Delta$Suniv > 0)

Question 4

The equilibrium constant at 427°C for the reaction N2(g)+ 3H2(g)     2NH3(g)is Kp = 9.4 × 10-5.Calculate the value of $\Delta$G° for the reaction under these conditions.

Accepted Answer

A) -33 kJ/mol 
B) -54 kJ/mol 
C) 54 kJ/mol 
D) 33 kJ/mol 
E) 1.3 J/mol 
A) -33 kJ/mol 
B) -54 kJ/mol 
C) 54 kJ/mol 
D) 33 kJ/mol 
E) 1.3 J/mol

Question 5

$\Delta$Hvap for ethanol is 38.7 kJ/mol at its boiling point (78°C).What is $\Delta$Ssurr when 1.00 mole of ethanol is boiled?

Accepted Answer

Question 6

Calculate $\Delta$G° for the reaction 3NO2(g)+ H2O(l)$\rarr$2HNO3(l)+ NO(g).

Accepted Answer

A) 8.7 kJ/mol 
B) 192 kJ/mol 
C) -414 kJ/mol 
D) -192 kJ/mol 
E) -155 kJ/mol 
A) 8.7 kJ/mol 
B) 192 kJ/mol 
C) -414 kJ/mol 
D) -192 kJ/mol 
E) -155 kJ/mol

Question 7

Using the thermodynamic data provided below, determine the temperature in °C at which the decomposition of solid calcium carbonate to form solid calcium oxide and oxygen becomes spontaneous.

Accepted Answer

The answer of Using the thermodynamic data provided below, determine...

Question 8

Which one of the following reactions would you expect to have highest $\Delta$S°?

Accepted Answer

A) CH4(g)+ 2O2(g)$\rarr$CO2(g)+ 2H2O(g) 
B) C2H2(g)+ 5/2O2(g)$\rarr$ 2CO2(g)+ H2O(g) 
C) C2H4(g)+ 3O2(g)$\rarr$2CO2(g)+ 2H2O(g) 
D) C2H6(g)+ 7/2O2(g)$\rarr$ 2CO2(g)+ 3H2O(g) 
A) CH4(g)+ 2O2(g)$\rarr$CO2(g)+ 2H2O(g) 
B) C2H2(g)+ 5/2O2(g)$\rarr$ 2CO2(g)+ H2O(g) 
C) C2H4(g)+ 3O2(g)$\rarr$2CO2(g)+ 2H2O(g) 
D) C2H6(g)+ 7/2O2(g)$\rarr$ 2CO2(g)+ 3H2O(g)

Which of the following is consistent with an exothermic reaction that is spontaneous at all temperatures?

For the reaction 3H₂(g)+ N₂(g) $For the reaction 3H<sub>2</sub>(g)+ N<sub>2</sub>(g) <sub> </sub> 2NH<sub>3</sub>(g), K<sub>c</sub> = 9.0 at 350°C.Calculate \Delta G° at 350°C.$ 2NH₃(g), K_c = 9.0 at 350°C.Calculate $\Delta$ G° at 350°C.

Which of the following is consistent with a spontaneous process in the forward direction?

$\Delta$ H_vap for ethanol is 38.7 kJ/mol at its boiling point (78°C).What is $\Delta$ S_surr when 1.00 mole of ethanol is boiled?

Calculate $\Delta$ G° for the reaction 3NO₂(g)+ H₂O(l) $\rarr$ 2HNO₃(l)+ NO(g). $Calculate \Delta G° for the reaction 3NO<sub>2</sub>(g)+ H<sub>2</sub>O(l) \rarr 2HNO<sub>3</sub>(l)+ NO(g).$

Using the thermodynamic data provided below, determine the temperature in °C at which the decomposition of solid calcium carbonate to form solid calcium oxide and oxygen becomes spontaneous.

Which one of the following reactions would you expect to have highest $\Delta$ S°?

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Exam 17: Entropy Free Energy and Equilibrium

Which of the following is consistent with an exothermic reaction that is spontaneous at all temperatures?

For the reaction 3H2(g)+ N2(g) 2NH3(g), Kc = 9.0 at 350°C.Calculate Δ\DeltaΔ G° at 350°C.

Which of the following is consistent with a spontaneous process in the forward direction?

The equilibrium constant at 427°C for the reaction N2(g)+ 3H2(g) 2NH3(g)is Kp = 9.4 × 10-5.Calculate the value of Δ\DeltaΔ G° for the reaction under these conditions.

Δ\DeltaΔ Hvap for ethanol is 38.7 kJ/mol at its boiling point (78°C).What is Δ\DeltaΔ Ssurr when 1.00 mole of ethanol is boiled?

Calculate Δ\DeltaΔ G° for the reaction 3NO2(g)+ H2O(l) →\rarr→ 2HNO3(l)+ NO(g).

Using the thermodynamic data provided below, determine the temperature in °C at which the decomposition of solid calcium carbonate to form solid calcium oxide and oxygen becomes spontaneous.

Which one of the following reactions would you expect to have highest Δ\DeltaΔ S°?

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

For the reaction 3H₂(g)+ N₂(g) $For the reaction 3H<sub>2</sub>(g)+ N<sub>2</sub>(g) <sub> </sub> 2NH<sub>3</sub>(g), K<sub>c</sub> = 9.0 at 350°C.Calculate \Delta G° at 350°C.$ 2NH₃(g), K_c = 9.0 at 350°C.Calculate $\Delta$ G° at 350°C.

$\Delta$ H_vap for ethanol is 38.7 kJ/mol at its boiling point (78°C).What is $\Delta$ S_surr when 1.00 mole of ethanol is boiled?

Calculate $\Delta$ G° for the reaction 3NO₂(g)+ H₂O(l) $\rarr$ 2HNO₃(l)+ NO(g). $Calculate \Delta G° for the reaction 3NO<sub>2</sub>(g)+ H<sub>2</sub>O(l) \rarr 2HNO<sub>3</sub>(l)+ NO(g).$

Which one of the following reactions would you expect to have highest $\Delta$ S°?